Scientists clone 'survivor' elm trees

March 29, 2012

Scientists at the University of Guelph have found a way to successfully clone American elm trees that have survived repeated epidemics of their biggest killer  Dutch elm disease.

The breakthrough, published today in the Canadian Journal of Forest Research, is the first known use of in vitro culture technology to clone buds of mature American elm trees.

"This research has the potential to bring back the beloved American elm population to North America," said Prof. Praveen Saxena, a plant scientist who worked on the project with Professor Alan Sullivan. Both are from Guelph's Department of Plant Agriculture.

"It may also serve as a model to help propagate and preserve thousands of other endangered plant species at risk of extinction across the globe."

Majestic American elms were among the most popular and recognizable trees in Ontario, lining boulevards and adorning city centres. But more than 95 per cent of the population in Eastern Canada and the United States has now been wiped out by Dutch elm disease.

The imported fungal infection interferes with water transport and stops nutrients from circulating in the tree. Only about one in 100,000 elms may be naturally resistant to the pathogen.

Looking for new techniques to clone and produce resistant trees through micropropagation, the Guelph researchers selected tissue samples from survivors in Ontario, including a century-old elm tree growing on the U of G campus.

"The trees that have survived initial and subsequent epidemics potentially represent an invaluable source of potential disease resistance for future plantings and breeding programs," Saxena said.

After growing genetic copies from the shoot tips and dormant buds, the researchers hope to select germplasm with the desired traits including disease-resistance which will further aid elm breeding and biotechnology programs around the world.

They also perfected a way to conserve germplasm over the long term. A germplasm repository now contains 17 accessions collected from mature elm trees that survived across Ontario.

"Our results demonstrate the usefulness of in vitro technologies for conserving and reintroducing endangered germplasm of economic, social and environment significance," Saxena said.

In vitro conservation technology is highly efficient and better than seed banks for conservation of many plant species, he added. Hundreds of genotypes with known phenotypes can be conserved in a safe small space and can easily be propagated.

The professors worked with Guelph postdoctoral researchers Mukund Shukla and Maxwell Jones; Chunzhao Liu, Professor, Chinese Academy of Sciences in Beijing; and Susan Gosling of the Gosling Foundation.

"We want to conserve and propagate the American elm and many other rare and endangered Canadian native species so that we can start to replace what has been decimated along the way," said Gosling.

Saxena said the team hopes to reintroduce disease-resistant trees. "The need to conserve endangered plant species in provinces such as Ontario where urban sprawl continues is crucial and urgent."

Related Stories

The USDA Forest Service Southern Research Station (SRS) today announced that an SRS scientist and other researchers have officially named the fungus responsible for killing redbay and other trees in the coastal plains of ...

(PhysOrg.com) -- The demise of the American chestnut is one of the great ecological disasters of our time, according to a chestnut expert in Penn State's College of Agricultural Sciences, who envisions a day in the not-so-distant ...

Mark Widrlechner may someday be known as the modern-day Johnny Appleseed for ash trees. As the devastating insect emerald ash borer is working its way across North America destroying almost all the native ash trees it encounters, ...

Landscape trees are increasingly being produced using container nursery systems rather than traditional field production practices. In contrast to field production techniques, successful container production requires a series ...

Two U.S. Department of Agriculture (USDA) scientists may have discovered "the map to El Dorado" for the American elm-a previously hidden population of elms that carry genes for resistance to Dutch elm disease. The disease ...

(PhysOrg.com) -- North Carolina State University researchers have found that a subset of fungus-farming ambrosia beetles may be in the early stages of a global epidemic threatening a number of economically important trees, ...

Recommended for you

Professor Hyun-Gyu Park of the Department of Chemical and Biomolecular Engineering at Korea Advanced Institute of Science and Technology (KAIST) has developed a technique to analyze various target DNAs using an aptamer, a ...

As an National Science Foundation (NSF)-funded entomologist, Virginia Tech's Paul Marek has to spend much of his time in the field, hunting for rare and scientifically significant species. He's provided NSF with an inside ...

(Phys.org)—A team of researchers with members from Washington University, Johns Hopkins School of Medicine, the Howard Hughes Medical Institute and the Polish Academy of Sciences has found that problems with RNA appear ...